Review on 🔌 Pack of 4 Autolite XP26-4PK Iridium XP Spark Plugs by Cornelius Reeves

These were installed on a 1973 Ford Mustang modified 460cc. in. High Performance Lincoln Motor. This modified engine simply chews and spits out stock spark plugs. The XP26 makes a very noticeable difference in engine performance. I get perfect ignition from these normally sooted plugs every time, even with a slightly rich fuel mixture. The play on these plugs is specified as 0.40 to 0.50. I found that most of them have a factor of 0.50 with no more than 0.02 variance for all, so no adjustment was needed. I am very satisfied with this product.